lepu-test-platform-web/node_modules/es5-ext/array/#/e-last-index-of.js

32 lines
954 B
JavaScript

"use strict";
var numberIsNaN = require("../../number/is-nan")
, toPosInt = require("../../number/to-pos-integer")
, value = require("../../object/valid-value")
, lastIndexOf = Array.prototype.lastIndexOf
, objHasOwnProperty = Object.prototype.hasOwnProperty
, abs = Math.abs
, floor = Math.floor;
module.exports = function (searchElement/*, fromIndex*/) {
var i, fromIndex, val;
if (!numberIsNaN(searchElement)) {
// Jslint: ignore
return lastIndexOf.apply(this, arguments);
}
value(this);
fromIndex = arguments[1];
if (isNaN(fromIndex)) fromIndex = toPosInt(this.length) - 1;
else if (fromIndex >= 0) fromIndex = floor(fromIndex);
else fromIndex = toPosInt(this.length) - floor(abs(fromIndex));
for (i = fromIndex; i >= 0; --i) {
if (objHasOwnProperty.call(this, i)) {
val = this[i];
if (numberIsNaN(val)) return i; // Jslint: ignore
}
}
return -1;
};